Lower limbs venous kinetics and consequent impact on drainage direction

Area of Science:

• Vascular Physiology
• Medical Imaging
• Hemodynamics

Background:

• Limited reference velocity values exist for lower limb venous hemodynamics.
• The impact of flow velocity on venous drainage direction requires further investigation.

Purpose of the Study:

• To assess venous flow velocities in different lower limb compartments.
• To evaluate the potential role of the Venturi effect in venous drainage.
• To identify physical models governing venous flow direction.

Main Methods:

• Echo-color-Doppler assessment of velocity and diameter in 36 lower limbs.
• Analysis of deep and superficial venous systems at multiple anatomical points.
• Comparison of flow elicited by manual calf compression/relaxation (CR) and active foot dorsiflexion (AFD).

Main Results:

• Velocity decreased from deep (N1) to superficial (N2, N3) venous systems for both CR and AFD maneuvers.
• Time average velocity (TAV) and peak systolic velocity (PSV) were significantly higher in the deep venous system.
• Venous diameter decreased from deep to superficial compartments.

Conclusions:

• Venous flow velocity decreases progressively from deep to superficial compartments in the lower limb.
• The Venturi effect is proposed as a potential mechanism for flow aspiration from tributaries to deeper veins.
• These velocity data provide a baseline for future studies on pathological and post-procedural venous conditions.